 He was a member of the Great Britain team 14 times, making three tours and playing in the 1968 World Cup.He appeared in three Yorkshire Cup Finals with Hull Kingston Rovers, and was part of the team that won the Eastern Division Championship in 1962.Peter Flanagan played in Hull Kingston Rovers' 13–10 victory over Huddersfield in the Eastern Division Championship Final during the 1962–63 season at Headingley Rugby Stadium, Leeds on Saturday 10 November 1962.